Seperating preciuos metals is a task not to be taken lightly. You need to know a lot, and it can be dangerous. That being said, it can be done on a small scale at home, however gold is easier to do still involves all of the chemicals and hazards). You can get some decent money from that scrap by selling to someone who deals in it. Look for the gold refining forum. It is full of everything needed for that and people who may want to buy them. Get a picture of the items. E-bay buyers tend to over pay for this stuff thinking that there is a ton of material in there.

It might be good to d3scribe the thermocouples, where they would be used, where are average people likely to find them in common articals.
How to store them, if you just get the tip part, or that and the wires ( some are quite long ) ot the tip, the wires, the plug.
How much they weigh on average, how many are needed to make a normal sized sale. What the $ return is like.